timer.php

<?php

/***********************************************************
 Copyright (C) 2008 Hewlett-Packard Development Company, L.P.

 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 version 2 as published by the Free Software Foundation.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along
 with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 ***********************************************************/

class timer
{
  public $startTime;

  public function __construct()
  {
    $this->startTime = time();
  }
  public function getStartTime()
  {
    return ($this->startTime);
  }
  public static function TimeAgo($timestamp)
  {
    // Store the current time
    $current_time = time();

    // Determine the difference, between the time now and the timestamp
    $difference = $current_time - $timestamp;

    // Set the periods of time
    $periods = array (
      "second",
      "minute",
      "hour",
      "day",
      "week",
      "month",
      "year",
      "decade"
    );

    // Set the number of seconds per period
    $lengths = array (
      1,
      60,
      3600,
      86400,
      604800,
      2630880,
      31570560,
      315705600
    );

    // Determine which period we should use, based on the number of seconds lapsed.
    // If the difference divided by the seconds is more than 1, we use that. Eg 1 year / 1 decade = 0.1, so we move on
    // Go from decades backwards to seconds
    for ($val = sizeof($lengths) - 1;($val >= 0) && (($number = $difference / $lengths[$val]) <= 1); $val--);

    // Ensure the script has found a match
    if ($val < 0)
      $val = 0;

    // Determine the minor value, to recurse through
    $new_time = $current_time - ($difference % $lengths[$val]);

    // Set the current value to be floored
    $number = floor($number);

    // If required create a plural
    if ($number != 1)
      $periods[$val] .= "s";

    // Return text
    $text = sprintf("%d %s ", $number, $periods[$val]);

    // Ensure there is still something to recurse through, and we have not found 1 minute and 0 seconds.
    if (($val >= 1) && (($current_time - $new_time) > 0))
    {
      $text .= self :: TimeAgo($new_time);
    }
    return $text;
  }
}
?>